I think he has a point, although the cause is likely population growth as well as better reporting not severity of the disasters themselves.
That's a good point. When I was an undergrad, one of my professors showed us a short film (3 minutes perhaps) that went through the population history of mankind. It was just a world map showing the population density and it would point out historical events. As it moved on through the decades and centuries, human population would increase a bit, decrease a bit. Then, all of a sudden, it explodes and makes dramatic increases in the last century or so. I saw that movie in 1994 or so, and it's stayed with me all this time.
According to Wki, human population
more than doubled from 1950 to 1999. (And, that's after doubling from 1850 to 1950.) So, perhaps this is really an issue of a tree falling in a forest w/ no one around to hear it fall. As it stands, when natural disasters occur, it's becoming increasingly rare where humans aren't around to feel its impact.